Abstract
A Fe87Hf5B8 alloy forms a crystallization layer with textured coarse α-Fe grains in the free surface of the melt-spun amorphous ribbon, which deteriorates the uniformity of nanocrystalline structure after annealing and leads to a high coercivity (Hc) of over 16 A/m. Doping of 0.1–0.2 at.% Y into the Fe87Hf5B8 alloy inhibits the surface crystallization of the melt-spun precursor and contributes to a uniform and fine nanostructure in the whole annealed ribbons. The Y-doped nanocrystalline alloys possess lower Hc of around 9 A/m and maintain high saturation magnetic flux density of 1.70 T. The suppression of the surface crystallization by Y doping is attributed to the improvement of amorphous-forming ability, which is mainly caused by the reduction of oxygen impurity content in the alloys.
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